PHP and mini program payment interface docking guide

Payment Interface Guide for PHP and Mini Programs

With the popularity of mobile payments, more and more merchants have begun to use mini programs as one of their main sales channels. To implement the payment function of the mini program, it needs to be connected to the corresponding payment interface. This article will introduce how to use PHP language to connect the payment interface of the mini program, and attach code examples for reference.

1. Preparation
   Before you start, make sure you have obtained the following information:
2. Merchant ID (MCHID)
3. API Key (KEY)
4. AppID of the mini program
5. Secret of the mini program
6. Signature generation
   Signature generation is very important for docking with the payment interface of the mini program. step. The following is an example function that can be used to generate a signature:

function createSign($params, $key){
    ksort($params);  //按照参数名ASCII码从小到大排序

    $string = '';
    foreach($params as $k => $v){
        if($v != '' && $k != 'sign'){
            $string .= $k . '=' . $v . '&';
        }
    }

    $string .= 'key=' . $key;
    $string = md5($string);  //签名加密

    return strtoupper($string);  //转换成大写
}

3. Unified order interface
   The unified order interface is the first step in mini program payment. The following is an example function that can be used to send a unified order request to the WeChat server:

function createUnifiedOrder($mchid, $key, $appid, $openid, $out_trade_no, $total_fee){
    $params = array(
        'appid' => $appid,
        'body' => '商品描述',
        'mch_id' => $mchid,
        'nonce_str' => md5(time()),
        'notify_url' => '支付成功回调地址',
        'openid' => $openid,
        'out_trade_no' => $out_trade_no,
        'spbill_create_ip' => $_SERVER['REMOTE_ADDR'],
        'total_fee' => $total_fee,
        'trade_type' => 'JSAPI'
    );

    //生成签名
    $params['sign'] = createSign($params, $key);

    //将数组转换为XML格式
    $xml = '<xml>';
    foreach($params as $k => $v){
        $xml .= '<' . $k . '>' . $v . '</' . $k . '>';
    }
    $xml .= '</xml>';

    //向微信服务器发送请求
    $url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);

    $response = curl_exec($ch);
    curl_close($ch);

    //解析XML响应
    $result = simplexml_load_string($response);
    $prepay_id = $result->prepay_id;  //获取预支付交易会话标识

    return $prepay_id;
}

4. Mini program payment operation
   The mini program needs to request the background to obtain the prepay_id, and then use this prepay_id performs payment operations. The following is an example function that calls the mini program for payment:

function getMiniProgramPayParams($mchid, $key, $appid, $openid, $out_trade_no, $total_fee){
    $prepay_id = createUnifiedOrder($mchid, $key, $appid, $openid, $out_trade_no, $total_fee);

    $params = array(
        'appId' => $appid,
        'timeStamp' => time(),
        'nonceStr' => md5(time()),
        'package' => 'prepay_id=' . $prepay_id,
        'signType' => 'MD5'
    );

    //生成签名
    $params['paySign'] = createSign($params, $key);

    return $params;
}

Conclusion:
Through the above steps, we can use the PHP language to connect to the payment interface of the mini program to realize the mobile payment function. Of course, in the actual application process, corresponding adjustments and expansions need to be made according to specific business needs. I hope the content of this article will be helpful to you and enable you to successfully implement the mini program payment function.

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